negotiator.utility
Class EvaluatorDiscrete

java.lang.Object
  negotiator.utility.EvaluatorDiscrete

All Implemented Interfaces:

Evaluator

public class EvaluatorDiscrete
extends java.lang.Object
implements Evaluator

This class is used to convert the value of a discrete issue to a utility. This object stores a mapping from each discrete value to a positive integer, the evaluation of the value. When asked for the utility of a value, the evaluation of the value is divided by the highest evaluation in the map. Note that this utility is not yet multiplied by the weight of the issue and therefore in the range [0,1].

Author:

Wouter Pasman

Constructor Summary

EvaluatorDiscrete()
Creates a new discrete evaluator with weight 0 and no values.

Method Summary

void	addEvaluation(ValueDiscrete value, java.lang.Integer evaluation) Add a new possible value to the issue.
void	clear() wipe evaluation values.
EvaluatorDiscrete	clone()
boolean	equals(java.lang.Object obj)
java.lang.Integer	getEvalMax()
java.lang.Double	getEvaluation(UtilitySpace uspace, Bid bid, int issueID) Returns the evaluation of the value of the issue of the bid.
java.lang.Double	getEvaluation(ValueDiscrete value)
java.lang.Integer	getEvaluationNotNormalized(Bid bid, int ID)
java.lang.Integer	getEvaluationNotNormalized(ValueDiscrete value)
Value	getMaxValue()
Value	getMinValue()
EVALUATORTYPE	getType()
java.lang.Integer	getValue(ValueDiscrete value)
java.util.Set<ValueDiscrete>	getValues()
double	getWeight()
int	hashCode()
java.lang.String	isComplete(Objective whichobj) Check whether the evaluator has enough information to make an evaluation.
void	loadFromXML(negotiator.xml.SimpleElement pRoot) Method to
void	lockWeight() Locks the weight of this Evaluator.
java.lang.Double	normalize(java.lang.Integer EvalValueL)
void	setEvaluation(Value val, int evaluation) Sets the evaluation for Value val.
void	setWeight(double wt) Sets the weigth with which an Objective or Issue is evaluated.
negotiator.xml.SimpleElement	setXML(negotiator.xml.SimpleElement evalObj) Sets weights and evaluator properties for the object in SimpleElement representation that is passed to it.
void	unlockWeight() Unlock the weight of this evaluator.
boolean	weightLocked()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EvaluatorDiscrete

public EvaluatorDiscrete()

Creates a new discrete evaluator with weight 0 and no values.

Method Detail

getWeight

public double getWeight()

Specified by:

getWeight in interface Evaluator

Returns:

the weight for this evaluator, a value between 0 and 1.

setWeight

public void setWeight(double wt)

Description copied from interface: Evaluator

Sets the weigth with which an Objective or Issue is evaluated.

Specified by:

setWeight in interface Evaluator

Parameters:

wt - The new weight.

lockWeight

public void lockWeight()

Locks the weight of this Evaluator.

Specified by:

lockWeight in interface Evaluator

unlockWeight

public void unlockWeight()

Unlock the weight of this evaluator.

Specified by:

unlockWeight in interface Evaluator

weightLocked

public boolean weightLocked()

Specified by:

weightLocked in interface Evaluator

Returns:

The state of the weightlock.

getValue

public java.lang.Integer getValue(ValueDiscrete value)

Parameters:

value - of which the evaluation is requested.

Returns:

the non-normalized evaluation of the given value.

getEvalMax

public java.lang.Integer getEvalMax()
                             throws java.lang.Exception

Returns:

the largest evaluation value available

Throws:

java.lang.Exception - if there are no alternatives.

getEvaluation

public java.lang.Double getEvaluation(UtilitySpace uspace,
                                      Bid bid,
                                      int issueID)
                               throws java.lang.Exception

Returns the evaluation of the value of the issue of the bid.

Specified by:

getEvaluation in interface Evaluator

Parameters:

uspace - preference profile.

bid - of which we want a value evaluated.

issueID - unique id of the issue of which we want the evaluation.

Returns:

utility of the value for an issue, not normalized by the issue weight.

Throws:

java.lang.Exception - if problem, for instance illegal evaluation values.

getEvaluation

public java.lang.Double getEvaluation(ValueDiscrete value)
                               throws java.lang.Exception

Parameters:

value - of the issue.

Returns:

normalized utility (between [0,1]) of the given value.

Throws:

java.lang.Exception - if value is null.

getEvaluationNotNormalized

public java.lang.Integer getEvaluationNotNormalized(Bid bid,
                                                    int ID)
                                             throws java.lang.Exception

Parameters:

bid -

ID - of the issue of which we are interested in the value

Returns:

non-normalized evaluation (positive integer) of the given value.

Throws:

java.lang.Exception - if bid or value is null.

getEvaluationNotNormalized

public java.lang.Integer getEvaluationNotNormalized(ValueDiscrete value)
                                             throws java.lang.Exception

Parameters:

value - of the issue.

Returns:

non-normalized evaluation (positive integer) of the given value.

Throws:

java.lang.Exception - if value is null.

normalize

public java.lang.Double normalize(java.lang.Integer EvalValueL)
                           throws java.lang.Exception

Parameters:

EvalValueL -

Returns:

normalized EvalValue

Throws:

java.lang.Exception - if no evaluators or illegal values in evaluator. ASSUMED that Max value is at least 1, becaues EVERY evaluatordiscrete is at least 1.

getType

public EVALUATORTYPE getType()

Specified by:

getType in interface Evaluator

Returns:

type of evaluation function, for example EVALUATORTYPE.LINEAR.

setEvaluation

public void setEvaluation(Value val,
                          int evaluation)
                   throws java.lang.Exception

Sets the evaluation for Value val. If this value doesn't exist yet in this Evaluator, adds it as well.

Parameters:

val - The value to add or have its evaluation modified.

evaluation - The new evaluation.

Throws:

java.lang.Exception - if evaluation

clear

public void clear()

wipe evaluation values.

loadFromXML

public void loadFromXML(negotiator.xml.SimpleElement pRoot)

Description copied from interface: Evaluator

Method to

Specified by:

loadFromXML in interface Evaluator

setXML

public negotiator.xml.SimpleElement setXML(negotiator.xml.SimpleElement evalObj)

Sets weights and evaluator properties for the object in SimpleElement representation that is passed to it.

Parameters:

evalObj - The object of which to set the evaluation properties.

Returns:

The modified simpleElement with all evaluator properties set.

isComplete

public java.lang.String isComplete(Objective whichobj)

Description copied from interface: Evaluator

Check whether the evaluator has enough information to make an evaluation.

Specified by:

isComplete in interface Evaluator

Parameters:

whichobj - is the objective/issue to which this evaluator is attached.

Returns:

String describing lacking component, or null if the evaluator is complete.

addEvaluation

public void addEvaluation(ValueDiscrete value,
                          java.lang.Integer evaluation)

Add a new possible value to the issue.

Parameters:

value - to be added to the issue.

evaluation - of the value.

getMaxValue

public Value getMaxValue()

Returns:

value with the highest evaluation.

getMinValue

public Value getMinValue()

Returns:

value with the lowest evaluation.

clone

public EvaluatorDiscrete clone()

Specified by:

clone in interface Evaluator

Overrides:

clone in class java.lang.Object

Returns:

clone of the current object.

getValues

public java.util.Set<ValueDiscrete> getValues()

Returns:

valid values for this issue.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object